Variable-diameter pulley



1930. J. E. SCHMIDT 1,770,948

VARIABLE DIAMETER PULLEY Filed ldarph 9, 1 928 i parts broken away andin section; and

Patented July 22,1930

JOHN scnmnrr, or orrroaeog inilrnbrs,

- wonrrs, on onroAeogrr-nrrrors,

g 1,77a94s Assienoit T 3mm BROS. nne rnnnnrna a conrona'rronor rumorsvAnIaieLn-n ran:nrnn PULLEY f j Application filed March ,9,

My invention relates to cylindrical or flat belt'pulleys and has for itsmain object the provision of a simple, convenient, and veffectivevariable diametercrown'ed cylindrical pulley construction, I

'WVith this object'in view my invention consists in certain features ofnovelty in the construction, combination, and arrangement ofparts bywhich the said object andcertain mother objects, hereinafter appearing,are

effected, all as fully described-withreference to the accompanyingdrawing and more particularly pointed out in the claims. 7

In thesaid drawing o v 1 Figure 1 is apartial front elevation 0? agrinding machine embodying'my invention, with parts broken awayand insection; Figure 2 is a similar enlarged view ofthe pulley constructionshown in Figure l with Figure 3 is a partial sectional viewonthe line 33 of Figure 1. V Like characters of reference indicate like parts in theseveral views. Y I 1 Referring to the drawing, 1 designates a grindingwheel shaft of a grinder, and this 7 shaft is rotatably mounted onspacedbear-. ings2 carriedon a main frame 3. See F igurel. Securedon' theshaft "1 between the bearings 2 and adjacentone thereof is a crownedcylindrical pulley4, and encircling 'thelsliaft l 'bet-ween the bearings2iare two crowned pulley sleeves 5. These-sleeves are of such diametersthat they may be nested o'n the pulley 1, as shown inxF-igure l'.

In order that the pulley sleeves 5 may be carried, nested over thecrowned portion of the pulley '4, with thep'ulleyand in coaxial relationtherewith,,ai1d preferably. independently of the crowned portions of thepulley and inner sleeve, the following is provided,

bearing 2 is formed with a circumferential ffiange 6. which engagesthe-bore of the inner sleeve 5, and the, corresponding end of. the innersleeve 5 is provided with acircumferen- 'tial flange 7 which engages thebore of the outer sleeve 5, whereby the corresponding ends 7 .of thesleeves are carried with the pulley in coaxia elati n therewith; he diamt rs inner sleeves 5. Th'us,

pulley 4, Where as supported on "the pulley 4 independently of crownedportion of the pulley and inner V v eters of the pulley. The end. of thepulley 4 next to the adjacent 192s.- seriarno. 260,348. 7 j

the-bores of the sleeves being such as to clear I the crownedportions ofthe pulley 4 and the moved axially with respect to the pulley and eachother to remove axially both sleeves or p the outer sleeve only fromtheir position over the pulley whereby to provide correspondingVaIIQiLIOIIS' of the effective diameter of the shown the sleeves 5 arethe sleeve the following additional means is prefrably provided. Thecorrespondingly opposite ends of the sleeves -5 are provided withinwardly projecting --radial;flanges 8 which are adapted to engage, withthe bores thereof,

a concentric reduced portion 9 on the corresponding end .of the pulleyand "to overlie axially'the shoulderof the pulley resulting from saidreduced portion, whereby the ends of the sleeves opposite the endsthereof corresponding with the flanges 6and Tare supported on the pulleyin coaxial relation therewith. A' through] diametrically oppositeapertures through the flanges 8 and are screwthreaded into the both ofthe sleeves, positioned. over the crowned portion of the pulley, withthe pulley. In Figure 1 both sleeves are shown nested over the crownedportion of the pulley, and in Figure 2 the inner sleeveonly is shownpositioned over axially from their positi'ons over the pulley thusproviding an additional pulley diameter. "endless flat belt thelpulleyfor driving the shaft 1, suitable belt f i 12 is trained. over adjustingmeans, not

shown, being utilized to accommodate the various diam- In' order thatthe sleeves may be conveniently supportedwhen they are positionedaxially out of their positions over the crowned portion of the pulley 5,the following is pro en of the p l eycerresp nd g with the ends thesleeves maybe pair. of beaded screws 11 pass pulley 4 to releasablysecure, one or j the pulley, it being obvious that both sleeves maybe'removed of the sleeves on which the flanges 8 are disposed, extendsabout the shaft 1. See particularly Figures 2 and 3. Screw studs 1i passthrough the aforementioned diametrically opposite apertures through theflanges 8 of the sleeveso and wing nuts 15 are screwthreaded on thescrew studs M to clamp one or both of the sleeves 5, spaced axially outof their positions over the crowned portion of the pulley 4, on thebracket l3, thus providing for conveniently carrying one or both of thesleeves when they are not in use. In Figure 1, both sleeves are shown 1nbroken vention, buthaving thus describediny invention, Icl-ann as newand desrreto secure by Letters Patent the following 1. In a variable dameter pulley the combinationwith a crowned cylindrical pulley, of apulley sleeve axially movable into and out of position over said pulley,.a-c-ircum-ferential flange on one end of said pulley and engageableinthe bore of said pulley-sleeve when said pulley sleeve is insuperposed position with said pulley, an inwardly projecting radialflange on the correspondingly opposite V vendof saidpulley sleeve,andmeans associated with said radial flan e for detachably securing saidpulley sleeve in superposed position with said pulley.

2. In a variable diameter pulley the combination with. a crownedcylindrical pulley, of a pulley sleeve axially movable into and out ofposition over said pulley, a circumferential flange on one end of saidpulley and engageable in the bore ofsaid pulley sleeve when said pulleysleeve is in superposed position, with said pulley, aninwardlyprrijecting radial flange on the correspondingly opposite end ofsaid pulley sleeve, and screw means for detachably securing said radialflange against the corresponding end of said pulley for securing saidpulleysleeve in superposed position with said pulley.

3. 1n a variable diameter pulley the coin bination with a crownedcylindrical pulley,

of two crowned pulley sleeves axially movable into and out of positionover said pulley in nested relation, circumferential flanles .on

correspondingendsof said pulley and ii e inner pulley sleeve, the.flange of saidgpulley being engageable in the'leore oi said inner pulleysleeve and the fiangeof said pulley sleeves are insuperposed positionwisleeve being e'ngageable in the bore of theouter pulley sleeve whensaid pulley sleeves are in superposed position with said pulley,inwardly projecting radial flanges on the correspondingly opposite endsof said pulley sleeves, and screw means for detachably securing .theradial flange of said inner pulley sl'eeve'or the radial flanges of bothof said pulley sleeves in overlying relation against the correspondingend of said pulley terse- :c'uring said inner pulley sleeve or both ofsaid pulley sleeves in superposed position with said pulley.

4. In a variable diameter pulley the combination with a crownedcylindrical pulley, of

two crowned pulley sleeves axially movable into and out of position oversaid pulley in nested relation, circumferential flanges on correspondingends of said pulley and the inner pulley sleeve, the flange of saidpulley being engageable in theboreof said inner pulley sleeve and theflange of said inner pulley sleeve being engageable in the bore of theouter pulley sleeve when said ,pul-ley sleeves are in superposedpositionwith said pulley, inwardly projecting radial fla'ngesonthe-correspondingly opposite ends of saidpulley sleeves, and screwdevices engageable in angularly spaced registe-rable holes through saidradial flanges for detachably securing the radial flange of said innerpulley sleeve or the radial flanges otboth of said pulley sleeves inoverlying relation against the corresponding end of said pulley forsecuring said inner pulley sleeve or both of said pulley sleeves insuperposed position with said pulley.

5. In a variable diameter pulley the combination with a revol-uble shaftand a cylindrical pulley, secured on said shaft, of a pulley sleeveencircling said shaft and axially .movable into and onto-f position oversaid pulley and provided with an inwardly proect-ing radial flangeon-one .end thereof, a

stationary support spaced along said shaft fromhsaidpulley, :and screwmeans operative upon said-flange for detachably securing said radialflan ge against the corresponding end of said pul-le'y for securing saidpulley sleeve in superposed position with said 1 pulley or for securingsaid radial flange against said support for securing said pulley sleeveout of superposed position. I

variable diameter pulley the cornbination witha. crowned cylindricalpulley,

of two crowned pulley sleeves axially 1119K" able into and out ofposition over said pulley in nested relation, circumferential flanges-oncorresponding ends of said pulley :and the inner pulley. sleeve, theflange of said pulley being .engageable the bore of said inner pulleysleeve and the flange of said inner pulley sleeve being .engageable inthe bore of the outer pulley sleeve when saidtpzul ley said pulley,inwardly projecting radial flanges on the correspondingly opposite endsofsaid pulley sleeves, a stationary support. spaced along said shaftfrom said pulley, and screw devices engageable in angularly spaced registerable holes through said radial flanges for detachably securing theradial flange of said inner pulley sleeve or the radial flanges of bothof saidpulley sleeves in overlying relation againstthe corresponding endof said pulley for securing said inner pulley sleeve or both of saidpulley sleeves in superposed position with said pulley and for securingthe radial flange of said outer pulley sleeve or the radial flanges ofboth said pulley sleeves in overlying relation against said support forsecuring said outer pulleysleeve orboth of said pulley sleeves out ofsuperposed position.

In witness whereof I hereunto alfix my signature this Qnddayof March,1928.

7 JOHN E. SCHMIDT.

